ST depression in lead I has some value in differentiating between the RCA and circumflex as the culprit artery in inferior STEMI. However, ST depression in lead I in inferior MI says nothing about presence or absence of RV MI. In our series of 160 inferior STEMI it had no diagnostic value for RV MI. It is V1 that is crucial for diagnosis of RV MI in the presence of inferior STEMI.

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